Blue Bloods is an American police procedural drama television series that has been airing on CBS since September 2010. Its main characters are members of the fictional Reagan family, a Catholic, Irish-American family in New York City with a history of work in law enforcement. Blue Bloods stars Tom Selleck as New York City Police Commissioner Frank Reagan; other main cast members include Donnie Wahlberg, Bridget Moynahan, Will Estes and Len Cariou for all 13 seasons, plus Amy Carlson (seasons 1–7), and Sami Gayle (seasons 1–11; played by Marlene Lawston in the pilot episode). The show is filmed on location in New York City with references to suburban areas as well. The series debuted on September 24, 2010, with episodes airing on Fridays following CSI: NY before being moved to Wednesdays at 10:00 p.m. Eastern and Pacific time and 9:00 p.m. Central and Mountain time for a four-week tryout. After four weeks, it returned to its original Friday 10:00 p.m. Eastern time slot, where it has remained since. In May 2020, CBS renewed the series for an eleventh season, which premiered on December 4, 2020. In April 2021, CBS renewed the series for a twelfth season, which premiered on October 1, 2021. In April 2022, CBS renewed the series for a thirteenth season, which premiered on October 7, 2022. Premise The series follows the Reagans, a family who has a history of work in law enforcement. Frank Reagan is the New York Police Department Police Commissioner. Frank's eldest son, Danny, is an NYPD Detective, his youngest son, Jamie, is an NYPD Sergeant, and his daughter, Erin, works as an Assistant District Attorney. Frank's second son, Joe (though the series mistakenly refers to him as the eldest in more recent episodes), was murdered by a corrupt cop in the line of duty in events that predate the series, when he was involved with an FBI investigation of a group of corrupt NYPD cops known as the Blue Templar. Frank's father, Henry, is a former NYPD beat cop who rose through the ranks to become Police Commissioner. The show's title references both the "blue blooded" concept of nobility as it relates to the Reagan family's powerful roles within New York City's criminal justice system as well as the American concept of an entire family who dedicate their lives to the law enforcement profession as one that "bleeds blue". Each member of the